Mercurial > hg > truffle
annotate src/cpu/x86/vm/metaspaceShared_x86_64.cpp @ 7182:c24f778e9401
Merge
author | johnc |
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date | Thu, 29 Nov 2012 11:23:15 -0800 |
parents | da91efe96a93 |
children | cd3d6a6b95d9 |
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0 | 1 /* |
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2 * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "assembler_x86.inline.hpp" | |
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27 #include "memory/metaspaceShared.hpp" |
0 | 28 |
29 // Generate the self-patching vtable method: | |
30 // | |
31 // This method will be called (as any other Klass virtual method) with | |
32 // the Klass itself as the first argument. Example: | |
33 // | |
34 // oop obj; | |
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35 // int size = obj->klass()->oop_size(this); |
0 | 36 // |
37 // for which the virtual method call is Klass::oop_size(); | |
38 // | |
39 // The dummy method is called with the Klass object as the first | |
40 // operand, and an object as the second argument. | |
41 // | |
42 | |
43 //===================================================================== | |
44 | |
45 // All of the dummy methods in the vtable are essentially identical, | |
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46 // differing only by an ordinal constant, and they bear no relationship |
0 | 47 // to the original method which the caller intended. Also, there needs |
48 // to be 'vtbl_list_size' instances of the vtable in order to | |
49 // differentiate between the 'vtable_list_size' original Klass objects. | |
50 | |
51 #define __ masm-> | |
52 | |
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53 void MetaspaceShared::generate_vtable_methods(void** vtbl_list, |
0 | 54 void** vtable, |
55 char** md_top, | |
56 char* md_end, | |
57 char** mc_top, | |
58 char* mc_end) { | |
59 | |
60 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*); | |
61 *(intptr_t *)(*md_top) = vtable_bytes; | |
62 *md_top += sizeof(intptr_t); | |
63 void** dummy_vtable = (void**)*md_top; | |
64 *vtable = dummy_vtable; | |
65 *md_top += vtable_bytes; | |
66 | |
67 // Get ready to generate dummy methods. | |
68 | |
69 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top); | |
70 MacroAssembler* masm = new MacroAssembler(&cb); | |
71 | |
72 Label common_code; | |
73 for (int i = 0; i < vtbl_list_size; ++i) { | |
74 for (int j = 0; j < num_virtuals; ++j) { | |
75 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc(); | |
76 | |
77 // Load eax with a value indicating vtable/offset pair. | |
78 // -- bits[ 7..0] (8 bits) which virtual method in table? | |
79 // -- bits[12..8] (5 bits) which virtual method table? | |
80 // -- must fit in 13-bit instruction immediate field. | |
81 __ movl(rax, (i << 8) + j); | |
82 __ jmp(common_code); | |
83 } | |
84 } | |
85 | |
86 __ bind(common_code); | |
87 | |
88 // Expecting to be called with "thiscall" convections -- the arguments | |
89 // are on the stack and the "this" pointer is in c_rarg0. In addition, rax | |
90 // was set (above) to the offset of the method in the table. | |
91 | |
304 | 92 __ push(c_rarg1); // save & free register |
93 __ push(c_rarg0); // save "this" | |
94 __ mov(c_rarg0, rax); | |
95 __ shrptr(c_rarg0, 8); // isolate vtable identifier. | |
96 __ shlptr(c_rarg0, LogBytesPerWord); | |
0 | 97 __ lea(c_rarg1, ExternalAddress((address)vtbl_list)); // ptr to correct vtable list. |
304 | 98 __ addptr(c_rarg1, c_rarg0); // ptr to list entry. |
99 __ movptr(c_rarg1, Address(c_rarg1, 0)); // get correct vtable address. | |
100 __ pop(c_rarg0); // restore "this" | |
101 __ movptr(Address(c_rarg0, 0), c_rarg1); // update vtable pointer. | |
0 | 102 |
304 | 103 __ andptr(rax, 0x00ff); // isolate vtable method index |
104 __ shlptr(rax, LogBytesPerWord); | |
105 __ addptr(rax, c_rarg1); // address of real method pointer. | |
106 __ pop(c_rarg1); // restore register. | |
107 __ movptr(rax, Address(rax, 0)); // get real method pointer. | |
0 | 108 __ jmp(rax); // jump to the real method. |
109 | |
110 __ flush(); | |
111 | |
112 *mc_top = (char*)__ pc(); | |
113 } |